> It's easy enough, 
>I'll call and find the offset of the Audi wheels, Germans cast it 
>into all alloys as an ET number, ET38 fi is a 38mm offset.
>Van wheel offset escapes me but will be easy enough to measure.  
>Anything fairly close (within 10mm or so) is largely acceptable 

Actually, a little more than 10mm is sufficient too, because it does work. 

Audi 5000/200 turbo alloy wheel:   6Jx15 H2 ET45

Vanagon "Carat" 5 spoke alloy wheel: 6Jx14 H2 ET30

chris